... Title : AC MAGNETIC FIELDS IN THE ... CALCULATIONS OF THE IMPEDANCE OF A ... IS ACCOMPLISHED BY TWO INDEPENDENT METHODS. ...

... OF THE MAGNETIZATION OF FERROMAGNETS REMAGNETIZED BY AN AC FIELD, WITH MAGNETIC HYSTERESIS TAKEN INTO ACCOUNT. ...

... Title : THE APPLICATION OF MAGNETIC FIELDS TO TIG WELDING ARCS-- PART I - TRANSVERSE AC MAGNETIC FIELD. Corporate Author : ...

... Title : CALCULATIONS OF THREE-DIMENSIONAL AC MAGNETIC FIELDS NEAR DEFECTS IN FERROMAGNETIC BARS. Corporate Author : ...

...AC-powered magnet. (a) Identification. An AC-powered magnet is an AC-powered device that generates a magnetic field intended to find and remove metallic foreign bodies from eye tissue. (b) Classification. Class...

... Title : AC LOSSES OF SUPERCONDUCTING COMPOSITES WITH 8 MU-M NBTI FILAMENTS IN A DC MAGNETIC FIELD WITH A ...

... SAMPLE AND AN AC MAGNETIC FIELD ... FREQUENCY, WHERE IMPEDANCE HERE IS ... THE RECONSTRUCTION METHOD ARE PRESENTED ...

In the present High Temperature Superconducting (HTS) maglev vehicle system, the nonuniformity of the magnetic field along the movement direction above the NdFeB guideway is inevitable due to the assembly error and inhomogeneous of the material property of the NdFeB magnet. In order to investigate the influence of the nonuniformity on ...

... THE PROBLEM OF THE AC MAGNETIC FIELD ... A LOWER DIMENSION, THE SECOND METHOD FITS BETTER ... OF THE TOTAL IMPEDANCE OF A ...

Vacuum poloidal magnetic field of tokamak in alternating-current (AC) operation is investigated. It is found that the vacuum magnetic field in AC operation is qualitatively different from that in direct-current (DC) operation. In the DC case, the vacuum ...

Experimental data on calcium-ion release in chicken brain tissue suggest that biological effects of electric and magnetic fields (EMFs) are concentrated at certain combinations of DC magnetic field strength and "critical" AC magnetic field frequencies. ...

The temperature dependence of the harmonics ((chi)n) of the ac magnetic susceptibility in HTS have been investigated by numerical solutions of the non linear diffusion equation for the magnetic flux. Within the framework of the collective pinning model, t...

This report discusses the AC losses in the MICE channelmagnets during magnet charging and discharging. This report talks aboutthe three types of AC losses in the MICE magnets; the hysteretic AC lossin the superconductor, the coupling AC loss in the superconductor and ...

The report deals with hysteresis losses at 4 K measured by magnetization and complex magnetic susceptibility. The theoretical and experimental relationships between ac susceptibility and magnetization as functions of dc field were examined in terms of the...

Solutions of the Leggett equations are obtained which describe the motion of magnetization in both superfluid phases of He/sup 3/ located in a strong dc magnetic field. Rotation of magnetization by an ac magnetic field is described. The results are ...

... We chose planar black lipid mem- branes for experimental studies of magnetic field effects on membranes because they are the simplest known ...

In present rapid cycling synchrotron magnets ac and dc currents flow in the same coil to give the desired field. The circuit reactance is made zero at dc and the operating frequency by running the magnet in series with an external parallel resonant LC cur...

... Accession Number : ADA211612. Title : Investigation of Resonant AC-DC Magnetic Field Effects. Descriptive Note : Final rept. May 1986-Jul 1989. ...

The frequency dependence of magnetic ac loss of thin superconductor strip subjected to an ac magnetic field perpendicular to the surface of the strip is investigated by incorporating a flux creep model into the critical state model of Brandt and Indenbom. It is found that the reduced ...

... reactor supplied at 50 or 150 Hz; Effects of High AC Magnetic Field Stimulus to the Development and Behaviour of the Nematode; Determining the ...

... The third moment, which is a measure of skewness of the MAE bust, is plotted as a function of the applied AC magnetic field intensity for steel ...

This paper proposes a new magnetic levitation scheme which is able to generate levitation force for all speeds including a standstill. Auxiliary wheels which are needed in EDS MAGLEV vehicle can be eliminated. This scheme uses AC superconducting magnets to generate levitation force. In this paper, magnetic ...

A series of prototype superconducting dipole magnets have been constructed and tested as part of the ISABELLE Project research and development program. Results of magnetic field measurements are presented with emphasis placed on the DC and AC components o...

The nonlinear stationary ac response of the magnetization of assemblies consisting of (i) noninteracting uniaxial superparamagnetic nanoparticles with aligned easy axes and (ii) randomly oriented nanoparticles subjected to superimposed ac and dc bias magnetic fields of arbitrary strength and ...

Self-assembly of magnetic microparticles in AC magnetic fields. Excitation of the system by an AC magnetic field provides a variety of patterns that can be controlled by adjusting the frequency and the amplitude of the field. At low ...

In present rapid cycling synchrotron magnets ac and dc currents flow in the same coil to give the desired field. The circuit reactance is made zero at dc and the operating frequency by running the magnet in series with an external parallel resonant LC current. We propose to return the ac flux ...

The motor-generator power supply and control circuits for the NIMROD synchrotron are described. These components are used to obtain pulsed and steady magnetic fields using magnet models AC1, 2, and 3. (auth)

Measurements of the ac and dc magnetic fields produced by natural internal ion currents in living systems are useful in principle because they can reduce or bypass the limitations of surface voltage measurements. The magnetic fields from the normal human ...

The important experiments showing nonlinear amplitude dependences of the neurite outgrowth in pheochromocytoma nerve cells due to ELF magnetic field exposure had been carried out in a nonuniform ac magnetic field. The nonuniformity entailed larger than expected variances in magne...

Recently reported observations by others indicates that a combination of a weak dc magnetic field and extra-low-frequency ac magnetic fields can produce resonant effects in biological systems. This study of resonant magnetic fields that consists of two ...

This paper attempts to explore the effects of the different external fields on the inverse susceptibility-temperature curve. The superlinear property found in the inverse susceptibility-temperature curve of magnetic nanoparticle colloid solutions is assumed to be related to dimer disruption. The ac magnetic ...

The UARS PEM level 2 VMAG AC daily product (UARPE2VMAGAC) contains ... measured with a peak detector and are the Vector Magnetic Field AC component. ...

Magnetization and ac susceptibility of a standard NbTi superconductor were measured as a function of longitudinal dc magnetic field. The ac-field-amplitude and frequency dependences of the complex susceptibility are examined. The magnetization is related to the ...

A series of prototype superconducting dipole magnets have been constructed and tested as part of the ISABELLE Project research and development program. Results of magnetic field measurements are presented with emphasis placed on the DC and AC components of the main field. ...

The quantum transport theory of electronic conduction in the presence of a strong magnetic field is extended to the case of an applied alternating transverse electric field. The ac magnetoconductivity is calculated for a long-wavelength electric field, ta...

The DC magnetization and AC complex magnetic susceptibilities were measured for MgB2 single crystals, unsubstituted and carbon substituted with the composition of Mg(B0.94C0.05)2. The measurements were performed in AC and DC magnetic fields oriented parallel to the c-axis ...

The effect of a magnetic field on the Gibbs free energy of a material depends on its magnetization behaviors. To investigate the change in the Fe-Fe3C phase diagram caused by a high external magnetic field, the magnetic Gibbs free energies of the phases such as austenite, ...

The nonlinear diffusion of magnetic flux into a superconducting sample can be studied by measuring the relaxation of the magnetisation after application of a step field or by measuring the ac susceptibility, (chi)(sub 1) and its third harmonic, (chi)(sub ...

Phone: +27283121196. Fax: +27283122039. Email: dkoch at hmo.ac.za, info at hmo.ac.za. Contact Address: Hermanus Magnetic Observatory, 1 Hospital Street ...

Energy dissipation, which is also called AC loss, of a composite multifilamentary superconducting wire is one of the most fundamental concerns in building a stable superconducting magnet. Characterization and reduction of AC losses are especially importan...

We report on the use of a single nitrogen-vacancy (NV) center to probe fluctuating ac magnetic fields. Using engineered currents to induce random changes in the field amplitude and phase, we show that stochastic fluctuations reduce the NV center sensitivity and, in general, make the NV response ...

We study quantum spin-rotation effects for a single-molecule magnet bridged between two conducting leads in the ac and dc magnetic fields. The Landau�Zener dynamics induced by the magnetic field generates mechanical torque, making the molecule to oscillate. This ...

Results are reported of low magnetic field studies of dc magnetic susceptibility and ac magnetic susceptibility of bulk samples and powders. These data are analyzed and compared with the microstructures and compositions of the samples as determined by scanning electron microscopic micrographs, ...

We apply a Langevin model to investigate the nonlinear ac responses of electro-magnetorheological (ERMR) fluids under the application of two crossed dc magnetic (z axis) and electric (x axis) fields and a probing ac sinusoidal magnetic field. We focus on the influence of ...

Alternating current loss as a function of current and external magnetic field in commercial NbTi superconductors has been measured with an electronic wattmeter. The loss varies as the current cubed, and the increase of loss with the external magnetic fiel...

A "peaking strip" is described which, when placed across the poles of a betatron, produces a sharp pulse whenever the magnetic field passes through zero. (A.C.)

A compact, easy to fabricate, noninductive, low surface magnetic field superconductor transmission line that has minimal stay fields is described.

... the applied axial AC magnetic field ranged from I kHz to 35 kHz ... were performed in a conventional Joule heated furnace under argon atmosphere for ...

Results are given for the permeability, conductivity, and dielectric constant of a multifilament superconductor, treated as an anisotropic state of matter. The calculations are made for the limiting cases of strong and weak ac magnetic fields compared with the field required for complete penetration of the ...

The design of an ac superconducting solenoid capable of producing oscillatory magnetic fields having peak-to-peak amplitudes as large as 1000 G at frequencies up to 500 Hz with only moderate dissipation is discussed. It is shown that a simple, inefficient...

Residual resistivity ratio RRR is an important integral characteristic of material purity. It was proposed to determine the RRR on base of the AC susceptibility. AC susceptibility of a number of single crystal niobium samples of different orientations types ( <100>, <011,><111> rpar; and differently treated (BCP 70, 150 ?m, annealing ...

The mechanical behavior of a ferromagnetic material is influenced by presence of magnetic field. The rate of stress relaxation in nickel increases by a.c. magnetic field of 11 Oersted (Oe) and 60 Hz. The application of 800 Oe steady magnetic field ...

Heavy impurity ions can be removed from the toroidal magnetic trap in the helical magnetic field of a conventional torsatron or heliotron with the use of an alternating current (ac) electric field. The passing particles can be transformed into helically trapped ones and escape from the ...

A pyrotron-type machine is designed for carrying out thermonuclear reactions. Loss of charged particles is minimized by reflecting them in an axially symmetrical magnetic field with an a-c electric field applied transversely to the magnetic field. (D.L.C.)

The isothermal magnetic transitions of a type 2 superconductor have been studied by AC susceptibility techniques as a function of the amplitude and frequency of the exciting field. The field variation of the complex susceptibility was used to determine th...

Numerical simulations of hysteretic ac losses in a bilayer superconductor/ferromagnet heterostructure subject to an oscillating transverse magnetic field are performed within the quasistatic approach, calling upon the ANSYS finite-element software program and exploiting magnetostatic-electrostatic analogs. It is shown that one-sided ...

We present a detailed magnetic study of iron containing carbon nanotubes (Fe-CNT), which highlights their potential for contactless magnetic heating in hyperthermia cancer treatment. Magnetic field dependent AC inductive heating experiments on Fe-CNT dispersions show a substantial temperature ...

An ac dipole magnet, which can work in two accelerator energy modes of 45 GeV and 60 GeV, is reported for the LANL synchrotron. In order to reach high uniformity of magnetic field distribution in good field region, some effective measures are presented to compensate field ...

Superconducting maglev vehicle is one of the most promising applications of HTS bulks. In such a system, the HTS bulks are always exposed to time-varying external magnetic field, which is generated by the inhomogeneous surface magnetic field of the NdFeB guideway. So it is required to study whether the guidance ...

We report on a new setup developed for neutron scattering experiments in periodically alternating magnetic fields at the sample position. The assembly consisting of rf generator, amplifier, wide band transformer, and resonance circuit. It allows to generate homogeneous ac magnetic fields over a ...

The magnetization loss density in stacked GdBa2Cu3O7?? coated conductor was measured using a SQUID magnetometer in a magnetic field normal to the tape surface to investigate the effect of stack on the magnetization loss. The AC loss characteristics are successfully collapsed to a single curve ...

Using a model of a system of interacting fine ferromagnetic particles, a computer simulation of the dynamical approach to local or global minima of the system is developed for two different schedules of the application of ac and dc magnetic fields. The process of optimization, i.e., the achievement of a global minimum, depends on the ...

An apparatus is designed for stabilizing a magnetic field to an accuracy on the order of 1 part in 10/sup 6/. The apparatus comprises a coil mounted in the field, d-c supply means for the coil, restoring torque means for the coil, an oscillator coil magnetically coupled to the coil, a-c ...

The AC loss characteristics of a magnet-superconductor system were studied with the magnet fixed to the free end of an oscillating cantilever located near a stationary melt-textured YBCO pellet. Below a threshold AC field amplitude {approx}2Oe, the dissipation of the oscillator is ...

The ac free-electron laser (ac FEL) uses an ac (temporally oscillating but spatially uniform) field as the pump source with the hope that electromagnetic radiation will be produced with wavelength shorter than that can be generated by a conventional magnet FEL. The ac ...

Superconducting maglev vehicle system requires that the surface magnetic field of the guideway is uniform along the forward direction. But in practice the surface magnetic field of the NdFeB permanent magnet guideway is not always immutable. So the HTS bulks in this case are exposed to ...

Optical DC current and voltage measurement using Faraday or Pockels effect necessitates the compensation of light intensity variation with some methods, because it is possible the intensity variation may give rise to a measuring error. We have proposed a method which suggests superposing AC magnetic field on linearly polarized light or ...

The successful application of superconductivity to motors and other power system components depends on the characterization and subsequent minimization of the ac loss in the superconductor used for fabrication of the component. The superconductive component, excited by an ac power source, may be exposed to large dc magnetic ...

Direction detectable static magnetic field imaging, which directly distinguishes the up and down direction of static perpendicular magnetic field from a sample surface and the polarity of magnetic charges on the surface, was demonstrated for CoCrPt-SiO2 perpendicular ...

... Organization: Hermanus Magnetic Observatory; Address: Hermanus Magnetic Observatory, P.O. Box 32, Hermanus, South Africa 7200; Email: pkotze@hmo.ac.za ...

... Organization: Hermanus Magnetic Observatory; Address: Hermanus Magnetic Observatory, P.O. Box 32, Hermanus, South Africa 7200; Email: pkotze@hmo.ac.za ...

Results are reported of low magnetic field studies of dc magnetic susceptibility and ac magnetic susceptibility of bulk samples and powders. These data are analyzed and compared with the microstructures and compositions of the samples as determined by sca...

AC losses in a superconductor strip are numerically evaluated by means of a finite element method formulated with a current vector potential. The expressions of AC losses in an infinite slab that corresponds to a simple model of infinitely stacked strips are also derived theoretically. It is assumed that the voltage-current characteristics of the ...

Magnetic measurements, like magnet design, is a broad subject. It is the intention of this lecture to cover only a small part of the field, regarding the characterization of the line integral field quality of multipole magnets (dipoles, quadrupoles and sextupoles) using compensated rotating ...

The response of 360� domain walls in narrow magnetic stripes to applied dc and ac currents, investigated by micromagnetic simulation, differs qualitatively from the response of 180� domain walls. The 360� domain-wall velocity scales with a dc current but is independent of an applied magnetic field along ...

When a nonuniform a-c field is applied to a charged particle it experiences a time-averaged acceleration in addition to the a-c acceleration. The development and application of the basic theory to plasmas are outlined, including some cases with a d-c magnetic field. A bibliography and a ...

Several investigators have studied flux varying in quadrature with a small ac field applied to a magnetic film in the presence of a perpendicular dc field, i.e., the imaginary part of the susceptibility. This phenomenon has often been interpreted as arisi...

A magneto-optical technique was developed to measure the spin-lattice relaxation time of paramagnetic ions in a crystal lattice as a function of applied static magnetic field strength. This method utilized the Faraday effect at low temperatures. An ac mag...

AC losses of NbTi-Cu and NbTi-Cu-CuNi superconducting composite magnets have been measured by means of an electronic integration technique. The experimental results are presented and their qualitative comparisons are made. It is shown within our experimental range that: (1) AC losses of NbTi-Cu composite magnet are ...

Two parallel magnetic flux paths are provided in a dynamoelectric machine having a superconductive field winding. A first, or main, magnetic flux path includes at least one area of nonferromagnetic or diamagnetic material. A second, or shunt, magnetic flux path prevents the relatively low frequency ...

Although much research has been conducted concerning the losses of high-(Tc) superconductors, very little has concentrated on the self-field losses in an actual magnet arrangement. The coils studied in this work were designed for use as actual magnets in ...

The harmonic balance finite element method (HBFEM) proposed is suited to analyzing the time-periodic magnetic field. An AC magnetic field calculation involving saturation characteristics requires many iterations and the intricate procedures for the time derivative. The procedure of the ...

Jul 22, 2011 ... Link: VIEW RELATED INFORMATION Description: IPY-HMO Website ... Email: dkoch at hmo.ac.za, info at hmo.ac.za. Contact Address: ...

A magnetic force microscopy method and improved magnetic tip for detecting and quantifying internal magnetic fields resulting from current of integrated circuits are disclosed. Detection of the current is used for failure analysis, design verification, and model validation. The interaction of the current on the ...

A magnetic force microscopy method and improved magnetic tip for detecting and quantifying internal magnetic fields resulting from current of integrated circuits. Detection of the current is used for failure analysis, design verification, and model validation. The interaction of the current on the integrated chip ...

Advanced implantation systems used for semiconductor fabrication need to transport low energy ion beams. In this respect it is an advantage to employ a short beam line. Strong magnetic field in a compact footprint can enable shorter beam lines. In this work we report the use of a superconducting magnet to generate the strong ...

with respect to the strength of the applied inhomogeneous magnetic field. Taking into ac- count the LGMFSelf-Diffusion Imaging by Spin Echo in Earth's Magnetic Field Ales Mohoric, Janez Stepisnik, Miha July 30, 1998 The NMR of the Earth's magnetic field ...

... takes place is hypothesized to occur as follows: (a) diatoms arrive at a ... and low frequency AC magnetic field tests based on diatom sensory biology. ...

We have previously reported results using a high precision gravimeter to probe local gravity changes

Mar 9, 2000 ... INSTRUMENT OUTLINE. Instrument: Search Coil Magnetometers. Reference/source: DE- 1, Polar, FAST. Species/. parameter: AC magnetic fields ...

Selected Navigations: Subject > A-C [x]; Search Criteria: Search Field: All > Results : All > Search Term: (Magnetic Separators) [x] ...

We apply ac and dc magnetic fields simultaneously in orthogonal directions to each other to a solution, in which paramagnetic microparticles are dispersed, and show that complex secondary structures composed of oscillating chain clusters, that is, long linear clusters interconnected by T-, L-, and criss-cross-junctions, are ...

... it achieves its high stability by using four matched diodes. ... placed in a 60 Hz AC magnetic field. ... volts supplies the zero-crossing detector electronics. ...

... outward flow of the electrons by diffusion (in the pressure range 0.1 to 10 rm Hg the loss of electrons and ions is due mainly to ambipolar diffusion). ...

AC magnetic fields are applied at the shell of the Madison Symmetric Torus (MST), and these penetrate into the plasma. The applied poloidal and toroidal fields are used in oscillating field current drive (OFCD). The initial OFCD system should be capable of driving a portion of the total plasma ...

Metallic taste has been reported from divers working with underwater electric welding and cutting. An in vitro model was designed to simulate the intraoral situation of the divers with respect to the magnetic field. Potentiostatic analyses were performed on amalgam samples exposed to AC and DC magnetic ...

Trapped field characteristics are one of the key factors in the application of high-temperature superconducting bulk, such as magnetic levitation systems, motors, bulk magnets and so on. The immutable trapped field is required in superconducting bulk applications as a quasi-permanent magnet, ...

Superconducting dipole magnets for accelerators have shown various quench current degradations and unexpected field disturbances even when they were fabricated with the same cables. Such degradations become harmful in terms of the stable operation of accelerators. The reasons for the degradations seem to be caused by AC losses due to ...

The distribution of an ac magnetic field in a conducting fiber composite of a finite length with components differing in their magnetic and electrical properties has been found. The geometry of the skin layer has been determined, and the degree of homogeneity of the magnetic ...

ac losses of superconducting solenoidal coils were investigated with a calorimetric method while applying a current or uniform magnetic field of 50 Hz with a sinusoidal wave form. The peak value of the ac current was varied from 0 to 15 rms A and that of the ac magnetic ...

Stray voltages in dairy facilities have been studied since the 1970`s. Previous research using steady-state ac and dc voltages has defined cow-contact voltage levels which may cause behavior and associated production problems. This research was designed to address concerns over possible effects of transient voltages and magnetic fields ...

Energy dissipation, which is also called AC loss, of a composite multifilamentary superconducting wire is one of the most fundamental concerns in building a stable superconducting magnet. Characterization and reduction of AC losses are especially important in designing a superconducting magnet for generating ...

Two ac dipoles with vertical and horizontal magnetic field have been proposed at RHIC for applications in linear and non-linear beam dynamics and spin manipulations. A magnetic field amplitude of 380 Gm is required to produce a coherent oscillation of 5 times the rms beam size at the top ...

Magnetic field fluctuations are inevitable in practical applications of superconductors and it is often necessary to estimate the AC losses these fluctuations induce. If the fluctuation wavelength is greater than the size of a superconductor, known estimates for an alternating uniform external magnetic ...

Low field magnetic measurements of a re-entrant system Ni{sub 81}Mn{sub 19} as a function of temperature are shown to exhibit two successive transitions. The ac susceptibility shows strong frequency dependence due to the frustrated spins. The freezing temperature, T{sub f}, shifts to higher temperatures with increasing frequency and ...

The change in the optical density of an emulsion of magnetic fluid drops suspended in a mineral oil under the action of electric and magnetic fields has been investigated. It is found that the sign of the change in transparency in an ac electric field depends on the field ...

A pair of coupling solenoids is used in MICE experiment to generate magnetic field which keeps the muons within the iris of thin RF cavity windows. The coupling solenoids have a 1.5-meter inner diameter and will produce 7.4 T peak magnetic field. Three types of AC losses in coupling solenoid ...

The magnetic and transport properties of Fe2VGa doped with metal M (M = Rh and Ti) have been obtained from the analysis of ac magnetic susceptibility ?ac, magnetization M vs magnetic field, specific heat C, and electrical resistivity ?. The results ...

In order to make non-viral gene delivery a useful tool in the study and treatment of genetic disorders, it is imperative that these methodologies be further refined to yield optimal results. Transfection of magnetic nanoparticles and nanorods are used as non-viral gene vectors to transfect HeLa EGFP-654 cells that stably express a mutated enhanced green fluorescent protein ...

To study the nonlinear dynamics of a uniformly precessing magnetization in perpendicularly magnetized (100) ferrite-garnet films, equations of motion are numerically solved over a wide ac field frequency range. Bifurcation changes in the magnetization precession and the states of dynamic ...

Magnetization AC losses in striated YBCO conductors in a perpendicular applied AC magnetic field were investigated with special regard to the coupling current AC loss (CCAC). The AC loss of YBCO samples of different length L was measured by using ...

A companion paper [Blanchard and B 19931 describes a predictive heuristic ion parametric resonance (IPR) model of magnetic field interactions with biological systems based on a selective relation between the ratio of the static magnetic field to the frequency of the AC ...

Magnetization measurements in the low frequency ac magnetic field for untwisted in situ prepared superconducting Cu-Nb composites are presented. Wires with various degrees of drawing deformation were examined. Penetration depth in the low field region increases with the deformation of the ...

This paper describes a method of effectively electroporating mammalian cell membranes with pulsed alternating-current (ac) electric fields at field strengths of 30-160 kV m(-1). Although many in vivo electroporation protocols entail applying square wave or monotonically decreasing pulses via needles or electrode plates, relatively few ...

This paper describes a method of effectively electroporating mammalian cell membranes with pulsed alternating-current (ac) electric fields at field strengths of 30-160 kV m?1. Although many in vivo electroporation protocols entail applying square wave or monotonically decreasing pulses via needles or electrode plates, relatively few ...

An electric motor using thyristor switches to allow connection to an ac supply voltage is described. The thyristor switching is accomplished in part, by the use of a sensor which notes and uses relative positions of the magnetic fields of the armature and of the field to change the gate voltage applied to the ...

The current distribution and also AC losses, in a multifilamentary superconductor carrying a transport current, are influenced by the self and the external magnetic field. By using the Maxwell equations, a model has been developed in order to calculate the temporal evolution of current distribution in a single wire exposed or not to ...

We report on the development of a sensitive high frequency susceptometer capable of measuring in the frequency range from 25 kHz up to 10 MHz with a volume susceptibility sensitivity of 3.5�l0-5 at 100 kHz corresponding to about 0.3% of the measured AC susceptibility. In combination with the previous reported DynoMag system capable of measuring dynamic ...

The magnetic properties of several powder samples of the high-Tc superconductors Hg-1212 and (HgTl)-1212 are investigated by means of ac and dc susceptibility measurements. The temperature dependence of irreversibility fields is determined up to magnetic fields of 14 T. It can be described in ...

A response of a triangular spin-chain system to a step variation of an external magnetic field is investigated in the framework of the 2D and 3D Glauber dynamics. It is shown that an unusual relaxation process observed experimentally at intermediate magnetic fields in Ca3Co2O6 is related to the growth of a domain ...

This report discusses the AC losses in the MICE channel magnets during magnet charging and discharging. This report talks about the three types of AC losses in the MICE magnets; the hysteretic AC loss in the superconductor, the coupling AC loss in the ...

Dissipative spin-tunneling transitions at biased resonances in molecular magnets such as Mn12 Ac are controlled by the dipolar field that can bring the system on and off resonance. It is shown that this leads to spin relaxation in form of propagating fronts of tunneling, with the dipolar field adjusting ...

We made a minimal set of AC magnetic measurements of the engineering model of the ALS Booster Dipole Magnet as part of the process of qualifying its design for production. Magnetic induction integrals over paths approximating electron-beam trajectories were measured with long curved coils connected to an electronic ...

We examine the properties of an elliptically polarized wiggler that will generate circularly polarized photons with energy spectrum of 3--12 KeV. The vertical wiggler magnetic field is produced by permanent magnets while the horizontal wiggler field is generated by electric coils capable of AC ...

This paper describes the design of a new test system. It is under construction now and will be used to measure the AC losses of subcable from NET conductors. A special feature of the test arrangement is that the losses will be determined while the sample carries a transport current and is at the same time subjected to changing magnetic ...

A method for dissipating a remanent field, created when a magnetic field is brought into contact with a superconductor, comprising the steps of (1) providing a ceramic superconductor; (2) continuously or intermittently applying an AC current to the ceramic superconductor; (3) gradually removing the ...

A method for dissipating a remanent field, created when a magnetic field is brought into contact with a superconductor, while preserving the diamagnetism of a superconductor comprises the steps of (1) providing a ceramic superconductor; (2) continuously or intermittently generating an AC current to the ceramic ...

Time-resolved measurements of the magnetization reversal in single crystals of Mn12Ac in pulsed magnetic fields, at magnetic field sweep rates from 1.5 kT/s up to 7 kT/s, suggest a new process that cannot be scaled onto a deflagrationlike propagation driven by heat ...

The superconducting maglev vehicle is one of the most promising applications of HTS bulks. In such a system, the nonuniformity of the magnetic field along the movement direction above the NdFeB guideway is inevitable due to the assembly error and inhomogeneity of the material property of the NdFeB magnet. So it is required to study the ...

Two of the most speculative particles are the magnetic monopole and the tachyon. One conjectures that these particles exist in cosmic rays as a combined ''tachyon monopole''. The fringing magnetic field of Fermilab's 15-foot bubble chamber is used to ''ac...

Magnetic Rubber Testing (MRT) is an extremely sensitive method for deteckng surface-breaking cracks in ferromagnetic materials, and is used extensively in critical inspections for D6ac steel components of the F-111 aircraft. This report documents a series...

A literature study on magnetic-inductive flowmeters for low conducting liquids was carried out and a special flowhead for this application has been constructed. The measurement on the primary head have been carried out with an ac-field and with a keyed-dc...

Mar 14, 1999 ... Effects of Radiation beyond the Van Allen Belts � Deflection of a beam of Electrons in ... How come a magnetic field can block particle radiation but not light? What is a "magnetic ... "Radiation Remediation"? Who invented AC? ...

A power system for a motor vehicle having an internal combustion engine and an electric machine is disclosed. The electric machine has a stator having coils for receiving ac electrical power to provide a magnetic field, a permanent magnet rotor spaced fro...

Online instruction from the Physics Department of the University of California. The site is organized around the following topics: Electrostatics, Capacitors and Inductors, Magnetostatics, Magnetic Fields of Currents, Electrodynamics, DC Circuits, AC Circuits, Electronics, and Mag Lev.

Superconducting maglev vehicle was one of the most promising applications of HTS bulks. In such a system, the HTS bulks were always exposed to AC external magnetic field, which was generated by the inhomogeneous surface magnetic field of the NdFeB guideway. In our previous work, it was observed ...

The piezoinductive effect in a ferroelectric ring with nonmagnetic conductive electrodes on its inner and outer surfaces and subjected to a dc bias magnetic field is discussed. The effect results from combination of the electromagnetic induction in the conductive loop and the piezoelectric effect in ferroelectrics. A theory for the direct and converse ...

In this paper, the cyclotron motion of a charged harmonic oscillator in contact with a dissipative heat bath is considered. Exact results for the ac conductivity are presented for three popular models: Ohmic, Drude and blackbody radiation heat bath models. Significant differences compared to the no memory results are observed in the real and imaginary parts of the ...

Theory of ac losses in the type II superconductors in the frame of the critical state model (J. Thompson, M. Maley, and J. R. Clem, J. Appl. Phys. 50, 3531, 3518 (1979)) is applied to high T/sub c/ materials (Y-Ba-Cu-O) assuming an exponential drop of the critical current density J/sub c/ with both magnetic field and temperature. The ...

The authors measured AC losses of AC multifilamentary wires (NbTi and Nb{sub 3}Sn) and a cable of (6+1) configuration due to transport currents in an AC external magnetic field at 50Hz. They also studied the stabilities of the NbTi and Nb{sub 3}Sn wires and the cable. The Nb{sub 3}Sn ...

Determining the low-temperature dependence of the specific absorption rate (SAR) of magnetic nanoparticles under alternating magnetic fields with amplitudes and frequencies similar to those used in applications such as magnetic fluid hyperthermia, becomes essential when theoretical expressions fail to extrapolate ...

that the anisotropy of the valence band affects the anisotropy of the magnetism. Indeed, previous studies have shown. (a) Temperature dependence of field-cooled magnetizations and (b) hysteresis curves along different temperatures. domain model, the magnetic free energy when an exter- nal field ...

The effect of the magnetizing method on the detectability of defects in welded joints was examined. It is shown that by varying the magnetizing method (circular magnetizationwith the field of current flowing through the central conductor inside the pipe or the field of current flowing directly on the tube; polar ...

AC loss is one of the main issues in the design of the CICC used for PF and TF coils of superconducting tokamak. A preliminary calculation of AC loss for the designed HT-7U CICCs used for TF magnets is given in this paper. We only consider the hysteresis and coupling losses related to transversal and longitudinal kinds. In addition to ...

We review approaches to recovering weak electric signals in the challenging environment of pulsed magnetic fields implemented at the National High Magnetic Field Laboratory Pulsed Field Facility (NHMFL-PFF). Recent technique developments including AC-specific heat ...

Magnetic structure is studied as a function of the orientation of the easy magnetic axis with respect to ac (4 Hz) and dc magnetizing fields in specimens with various coercivities. Alternating boundary polarity was observed, and a system of magnetization distribution in the ...

The 3 GeV Booster synchrotron for TRIUMF's KAON Factory will need 24 dipole magnets each 3.0 m long operating with a resonant power system designed to give a 50 Hz ac field superimposed onto a dc field. The maximum and minimum field levels are 1.118 and 0.295 T respectively. In this ...

Nitrogen-Vacancy (NV) centers in diamond are being actively investigated as a platform for nanoscale magnetic field sensing. In many of the envisioned applications the target AC magnetic field fluctuates over time and cannot be triggered in synchrony with the pulse protocol controlling NV ...

Magnetism can affect losses in superconducting coils in two ways. First, there is magnetic loss ('core loss'). This can be separately measured as a function of magnetic induction in the material of interest (usually the substrate on which a superconducting film is grown). One can then find the fields in the coil ...

A magnetohydrodynamic generator using a nuclear material in the working fluid which is passed through a magnetic field during fission, is designed for the production of a-c power. The generator is similar to that described in British Patent 928,836, except that a-c is produced by cyclically varying the ...

A theoretical and experimental study is presented of the influence of thermally activated flux creep on the ac response of a type II superconductor in the mixed state. The theory describes the ac response of a cylindrical superconductor in the mixed state in an axial dc magnetic field and a superposed parallel ...

Flagella have been employed as nanoactuators for biomimetic microswimmers in low Reynolds number fluidic environments. The microswimmers utilize flagellar filaments isolated from Salmonella typhimurium to mimic the spiral-type propulsion mechanism of flagellated bacteria. The microswimmer included a polystyrene microbead conjugated to one or multiple magnetic nanobeads via ...

Recent results are reported pertaining to research of ac losses in superconductors with regard to magnet technology. Emphasis is on aspects which are important in demonstrating the technical feasibility and economical advantages of ac superconducting windings. In the domain of hysteresis losses the paper reports the extension of the ...

the current through fixed resistors fed with a measured AC voltage. Such a sensor is also sensitive to stray Strategy for Locating and Eliminating Sources of Mains Frequency Stray Magnetic Fields J. B. Pawley HVEMEliminatingSourcesof Mains-frequency Stray Magnetic Fields It is generally ...

create a dynamo that generates the Earth's magnetic field of two poles aligned with the spin axis the Earth's convection, and this mainly generates the magnetic field. This new information prompted new in 2007. A dynamo generates the Earth's magnetic field, but no one is ...

Exposure of human erythrocytes photosensitized with hematoporphyrin dihydrochloride to a magnetic field (180kHz, 4.6kA/m) resulted in time- and hematoporphyrin-concentration-dependent lysis. The singlet oxygen scavenger histidine inhibited lysis, indicating the direct involvement of radicals in erythrocyte lysis. Exposure not only to light but also to an ...

into electrical energy by rotating magnets near coils of conducting wire that are wrapped around iron cores. When Is the induced current AC or DC? 17.4 Induced Magnetism How can the magnetic field of an induced current be used induced current and magnetism to trade voltage ...

IEEE TRANSACTIONS ON MAGNETICS, VOL. 46, NO. 6, JUNE 2010 2187 Novel Solder-Magnetic Particle University, Pittsburgh, PA 15213 USA Intel Corporation, Chandler, AZ 85226 USA Localized heating of solder to AC magnetic fields. However, for typical solder pastes with fine solder powders dispersed ...

Magnetic hyperthermia is a type of cancer treatment that utilizes the heat generated from magnetic particles to destroy cancer cells selectively. The heating efficiency depends strongly on the magnetic properties of the particles. In this paper, we experimentally verify the heat generation efficiency of magnetite particles of various ...

A simple technique to evaluate the effective magnetization due to eddy currents excited by ac magnetic fields in finite conductive objects is presented. The principal technique relies on assuming a similarity between eddy current magnetization and the magnetization due to ...

. This includes permanent magnets, superconducting and room tempera- ture electro-magnets for both the planar undulators using either per- manent magnets or electro-magnets (room temperature or superconducting). Section or electro-magnet (room temperature of superconducting). One should ...

We present here results of our study of the 5-m-long AC transmission tine model with 1 kA current capability at 77 K. Primary attention was paid to the current characteristics and AC losses in individual tapes and in the core of the cable. The losses were measured as a function of AC magnetic ...

Multifilamentary Bi2223 tapes are exposed to the longitudinal magnetic field as well as the transverse one in some electrical power apparatuses such as multilayer power transmission cables. Here, we define the longitudinal and transverse magnetic fields as the field components parallel and ...

The elliptical multipole wiggler (EMW) has been designed, constructed, and installed in the X13 straight section of the NSLS X-ray Ring. The EMW generates circularly polarized photons in the energy range of 0.1-10 keV with AC modulation of polarization helicity. The vertical magnetic field of 0.8 T is produced by a hybrid permanent ...

The authors recently reported that cephalic regeneration in the planarian Dugesia tigrina was significantly delayed in populations exposed continuously to combined parallel DC and AC magnetic fields. This effect was consistent with hypotheses suggesting an underlying resonance phenomenon. The authors report here, in a parallel series ...

Hysteretic ac losses in a thin, current-carrying superconductor strip located between two flat magnetic shields of infinite permeability are calculated using Bean's model of the critical state. Exact numerical calculations and approximate analytical forms delineating the penetration of magnetic flux and the energy dissipated during a ...

Many high-Tc superconducting (HTS) tape manufactures make an effort to improve the transport characteristics of HTS tapes. When AC or DC current flows in the HTS tape, AC or DC magnetic self-fields are induced around the conductor by the current and these self-fields affect on the ...

Five subtasks are reported on: ac electric and magnetic fields, dc fields and ion measurements, gaseous dielectrics research (SF/sub 6/ mixtures), interfacial phenomena in liquids, and nanosecond breakdown in power system dielectrics. (DLC)

Here we report theoretical transport calculations on carbon-based nanomaterials used as resonator cavities under the effects of a time-dependent field. A magnetic field is considered as an extra modulator tool, able to encode binary ON or OFF transmission states on the quantum systems. Regular either complex conductance Fabry-P�rot ...

Specific heat (Cp) and magnetocaloric effect (MCE) are useful tools in the experimental determination and understanding of the temperature-magnetic field phase diagram of materials. While previous studies are mostly limited to measurements in DC magnets, here we discuss a new AC calorimeter to measure these ...

The ac in-phase and out-of-phase response of type II superconductors is discussed in terms of dc magnetization curves. Hysteresis in the dc magnetization is shown to lead to a dependence of the ac response on the rate at which an external field is swept. This effect allows both H/sub c/1 and ...

A novel multiplexed sensing scheme based on the measurement of the magnetic susceptibility of the affinity captured target molecules on magnetic nanoparticles in liquid suspension is proposed. The AC magnetic susceptibility provides a measurement of Brownian relaxation behavior of biomolecules bound to ...

Substituted strontium ferrite SrFe12-xCrx/2Alx/2O19 (x=0-2.5) was prepared by sol-gel method. Ac susceptometer, and 57Fe M�ssbauer spectroscopy were used to analyze the structure, static and dynamic magnetic properties of the prepared samples. M�ssbauer spectra show that Al-Cr ions preferentially occupy the 12k sites. Magnetic ...

We analysed magnetic nanoparticle biodistribution, before and after cytokine conjugation, in a mouse model by ac susceptibility measurements of the corresponding resected tissues. Mice received repeated intravenous injections of nanoparticle suspension for two weeks and they were euthanized 1 h after the last injection. In general, only 10% of the total ...